Filter radiometry based on direct utilization of trap detectors

TLDR

The new filter radiometer is an improved version of our earlier designs. A new design for a filter radiometer based on a trap detector, temperature‑controlled filters, and a precision aperture is described, enabling high‑accuracy scales for illuminance, luminous intensity, and spectral irradiance. The radiometer features an easily and reliably changeable filter and was characterized with a lambda filter using two methods. The improved design is more suitable for spectral irradiance measurements, and the characterization results agree within 0.3%.

Abstract

A new design for a filter radiometer based on a trap detector, a set of temperature-controlled filters, and a precision aperture is described. This filter radiometer can be used to realize high-accuracy scales for illuminance, luminous intensity, and spectral irradiance. The new filter radiometer is an improved version of our earlier designs. It has been improved in such a way that the filter can be easily and reliably changed. This makes it more suitable for spectral irradiance measurements, where lamps usually have to be measured at several wavelengths. The results of the characterization of the filter radiometer equipped with a lambda filter using two different methods are presented. The results are in agreement at the level of 0.3%.